/**
 * Software License, Version 1.0
 *
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 *
 *
 *Redistribution and use in source and binary forms, with or without
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For
 * further information contact the Community Grids Lab at
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and
 * wherever such third-party acknowledgments normally appear.
 *
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering,
 * shall not be used to endorse or promote products derived from this software
 * without prior written permission from Indiana University.  For written
 * permission, please contact the Advanced Research and Technology Institute
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering,
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 *
 *
 * Indiana University provides no reassurances that the source code provided
 * does not infringe the patent or any other intellectual property rights of
 * any other entity.  Indiana University disclaims any liability to any
 * recipient for claims brought by any other entity based on infringement of
 * intellectual property rights or otherwise.
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS.
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS",
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION
 *GENERATED USING SOFTWARE.
 */

package cgl.narada.service.timer;


/**
 * 
 * @author Hasan Bulut - hbulut@indiana.edu Community Grids Lab., Indiana
 *         University
 * @version 1.0
 */
public class WindowsClock extends ClockI {
    // ~ Static fields/initializers
    // -----------------------------------------------

    private static WindowsClock instance = new WindowsClock();

    // ~ Instance fields
    // ----------------------------------------------------------
    private String libPath = "/ext/windows/hrtimerwin.dll";
    private long baseTimeMillis = 0;
    private long baseTimeMicros = 0;

    // ~ Constructors
    // -------------------------------------------------------------

    /**
     * Generates a new WindowsClock object.
     */
    private WindowsClock() {
        // String temp = globalServiceProperties.getProperty("NB_HOME");
        //
        // if (temp != null) {
        // NB_HOME = temp;
        // }

        String NB_HOME = HRClock.getNBHome();
        System.out.println("*NB_HOME : " + NB_HOME);

        libPath = NB_HOME + "/ext/windows/hrtimerwin.dll";
        System.out.println("Loading library " + libPath);
        System.load(libPath);
        baseTimeMillis = System.currentTimeMillis();
        initValues(baseTimeMillis);
        baseTimeMicros = baseTimeMillis * 1000;
        System.out.println("init sys time:\t" + baseTimeMillis);
        // */
    }

    // ~ Methods
    // ------------------------------------------------------------------

    /**
     * Returns clock implementation for Windows machines.
     * 
     * @return ClockI - interface that has been implemented.
     */
    public static ClockI getClock() {
        return instance;
    }

    /**
     * Makes a call to native side to get local clock time as microseconds
     * 
     * @return long - time as microseconds
     */
    public native long getLocalMicroseconds();

    /**
     * Makes a call to native side to get local clock time as milliseconds
     * 
     * @return long - time as milliseconds
     */
    public native long getLocalMilliseconds();

    /**
     * Makes a call to native side to causes thread to sleep for the specified
     * amount in milliseconds.
     * 
     * @param sleepVal -
     *            sleep time in milliseconds
     */
    public native void sleep(int sleepVal);

    /**
     * Returns time in microseconds. Adjusts time with base time.
     * 
     * @return long - local time as microseconds
     */
    public long getTimeMicroseconds() {
        return getLocalMicroseconds();
    }

    /**
     * Returns time in milliseconds. Adjusts time with base time.
     * 
     * @return long - time as milliseconds
     */
    public long getTimeMilliseconds() {
        return getLocalMilliseconds();
    }

    /**
     * Simple test program.
     * 
     * @param args -
     *            input arguments, no arguments used.
     */
    public static void main(String[] args) {
        ClockI wintmr = WindowsClock.getClock();
        long tmsec = 0;
        long tusec = 0;
        System.out.println("System time:\t" + System.currentTimeMillis());
        // tmsec = wintmr.getTimeMilliseconds();
        tmsec = wintmr.getTimeMilliseconds();
        tusec = wintmr.getTimeMicroseconds();
        System.out.println("msec: \t\t" + tmsec);
        System.out.println("usec: \t\t" + tusec);
    }

    /**
     * Initializes clock values for windows systems.
     */
    private native void initValues(long baseTime);
}
